^c The adoption of Christianity in Poland is seen by many Poles, regardless of their religious affiliation or lack thereof, as one of the most significant national historical events; the new religion was used to unify the tribes in the region.

4.

^d The area of Poland according to the administrative division, as given by the Central Statistical Office, is 312,679 km2 (120,726 sq mi) of which 311,888 km2 (120,421 sq mi) is land area and 791 km2 (305 sq mi) is internal water surface area.[8]

The word "Poland" was written officially for the first time in 966. In 1569, Poland formed a strong union with Lithuania called the Polish-Lithuanian Commonwealth. At some point in its history, it was the largest state in Europe and became very influential. Much of the territory that now makes up Central European states used to belong to the Commonwealth. Eventually, after entering a somewhat sudden yet steady decline, the Commonwealth collapsed in 1795 and the Polish nation didn't have a country for 123 years. Poland regained its independence in 1918 after World War I. In 1921, Poland defeated Soviet Russia in the Polish-Soviet War that started in 1919.

However, Poland lost independence again not long after the beginning of World War II, after suffering a defeat from the USSR and Nazi Germany. Although the government capitulated, the Polish people fought on by forming the largest and most effective resistance movement in Nazi-occupied Europe. It is most notable for disrupting German supply lines to the Eastern Front of WWII, providing military intelligence to the British, and for saving more Jewish lives in the Holocaust than any other Allied organization or government. After the war, Poland regained ''independence'' and became a communist country within the Eastern Bloc, but the new government was appointed by Joseph Stalin and was under the control of the Soviet Union.

The first sign of humans in Polish lands was 500,000 years ago. The Bronze Age started around 2400-2300 BC. The Iron Age started around 750-700 BC. At that time the Polish lands were under the influence of the Lusatian culture. About 400 BC Celtic and Germanic tribes lived there. Those people had trade contacts with the Roman Empire.

Over time, Slavs came to Polish lands. Some of those Slavs, now commonly referred to as Western Slavs (though in reality a diverse group of tribes with shared ethnic and cultural features), stayed there and started to create new nations. The most powerful tribe was called the Polans, who united all of the other Slavic tribes living there, and this is where the name "Poland" comes from.

On September 1, 1939, World War II started when Nazi Germany attacked Poland. The Soviet Union attacked Poland on September 17, 1939. Warsaw was defeated on September 28, 1939. Poland was split up into two pieces, one half owned by Nazi Germany, the other by the Soviet Union. More than 6 million Polish people died, and half of these people were Jewish. Most of these deaths were part of the Holocaust, in which 6 million Jews were killed. At the war's end, Poland's borders were moved west, pushing the eastern border to the Curzon line.[12] The western border was moved to the Oder-Neisse line. The new Poland became 20% smaller by 77,500 square kilometers (29,900 sq mi). The shift forced millions of Poles, Germans, Ukrainians, and Jews to move.

Poland's current boundaries were made after 1945. The grey areas went from Poland to the Soviet Union. The pink areas from Germany to Poland

Physical land features of Poland.

After these events Poland gradually became a communist country. It was supposedly an independent country. But in reality the new government was appointed by Joseph Stalin. It was also under the control of the Soviet Union. The country was then renamed the People's Republic of Poland. There are many Poles in the neighboring countries Ukraine, Belarus, and Lithuania (these three countries were part of the Soviet Union until 1991), as well as in other countries. The most Poles outside of Poland are in the United States, especially in Chicago. Germany and the United Kingdom are also home to a large Polish diaspora. The most recent mass emigration of Poles to western countries began after 1989.

Currently, the Prime Minister is Ewa Kopacz. On 10 April 2010 the President Lech Kaczyński died in a government plane crash in Smolensk in Russia. The president is elected directly by the citizens for a five-year term. The Prime Minister is appointed by the President and confirmed by the "Sejm". The Sejm is the lower chamber of Parliament legislature for the country. It has 460 deputies elected every four years.

The Polish Baltic coast is mostly smooth but has natural harbors in the Gdańsk-Gdynia region and Szczecin in the far northwest. This coast has several spits, dunes and coastal lakes. Coast lakes are former bays that have been cut off from the sea. These areas are sometimes called lagoons. Szczecin Lagoon is on the western border with Germany. The Vistula Lagoon is on the eastern border with Kaliningrad, province of Russia. The longest river in Poland, the "Vistula" river, empties into the Vistula Lagoon and also directly into the Baltic Sea.

The northeastern region is densely wooded, sparsely populated and lacks agricultural and industrial resources. The geographical region has four hilly districts of moraines and lakes created by moraines. These formed during and after the Pleistoceneice age. The Masurian Lake District is the largest of the four districts and covers much of northeastern Poland.

Poland has many lakes. In Europe, only Finland has more lakes. The largest lakes are "Śniardwy" and "Mamry". In addition to the lake districts in the north, there is also a large number of mountain lakes in the Tatras mountains.

South of the northeastern region is the regions of Silesia and Masovia, which are marked by broad ice-age river valleys. Silesia region has many resources and people. Coal is abundant. Lower Silesia has large copper mining. Masovian Plain is in central Poland. It is in the valleys of three large rivers: Vistula, Bug and Narew.

Farther south is the Polish mountain region. These mountains include the Sudetes and the Carpathian Mountains. The highest part of the Carpathians is the Tatra mountains which is along Poland’s southern border. The tallest mountain in Poland, "Rysy" at 2,503 m (8,210 ft), is in the High Tatras.

Poland is made of sixteen regions known as voivodeships (województwa, singular - województwo). They are basically created from the country's historical regions, whereas those of the past two decades (till 1998) had been focused on and named for separate cities. The new units range in areas from under 10,000 km² (Opole Voivodeship) to over 35,000 km² (Masovian Voivodeship). Voivodeships are controlled by voivod governments, and their legislatures are called voivodeship sejmiks.

In the past few years, Poland's population has gone down because of an increase in emigration and a sharp drop in the birth rate. In 2006, the census office estimated the total population of Poland at 38,536,869, a very small rise on the 2002 figure of 38,230,080. Since Poland's accession to the European Union, a large number of Polish people have moved to work in Western European countries like the United Kingdom and the Republic of Ireland. Some organizations state people have left because of high unemployment (10.5%) and better opportunities for work somewhere else. In April 2007, the Polish population of the United Kingdom had risen to about 300,000 people and estimates predict about 65,000 Polish people living in the Republic of Ireland. However, in recent years strong growth of Polish economy and increasing value of Polish currency (PLN) makes many Polish immigrants to go back home. In 2007, the number of people leaving the country was lower than people who are coming back. Poland became an attractive place to work for people from other countries (mainly Ukraine).

A Polish minority is still present in neighboring countries of Ukraine, Belarus, and Lithuania, as well as in other countries. The largest number of ethnic Poles outside of the country can be found in the United States.